1. 安装xcode工具
xcode-select --install
2. 安装rvm
curl -L get.rvm.io | bash -s stable
rvm list known (找到最新的rvm版本)
rvm install 2.4
3.改数据源
gem sources -a https://gems.ruby-china.org
gem sources --remove https://rubygems.org/
5. 安装rails
sudo gem install rails
6. 安装cocoapods
sudo gem install cocoapods
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